High-temperature-resistant low-filtration retaining wall water-based drilling fluid

Abstract

The invention discloses a high-temperature-resistant low-filtration retaining wall water-based drilling fluid and belongs to the technical field of petroleum drilling. The drilling fluid comprises, by weight, 100 parts of clear water, 3-6 parts of bentonite, 0.5-1 part of a diluent, 0.6-1.2 parts of a cation inhibitor, 3-4 parts of a salt-and-calcium-resistant filtrate reducer, 2-3 parts of a high-temperature-resistant filtrate reducer, 2-3 parts of a collapse prevention wall protective agent, 2-4 parts of a low-fluorescence sticking-prevention lubricant, 0.1-0.3 part of an alkaline pH value regulator and 20-30 parts of a weighting agent. The drilling fluid has stable performance, good rheological property and lubricity under conditions of high temperature and high pressure, has good wall building property and inhibitive ability, and is beneficial to maintain hole-wall stability and carry rock debris. The high-temperature-resistant drilling fluid is suitable for deep well drilling and core drilling of gravelly ground, and has applicability for high-temperature geothermal well drilling.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling, and in particular relates to a water-based drilling fluid with high temperature resistance and low filtration loss for wall protection. Background technique [0002] With the increase of well depth, the bottom hole temperature rises, and the high temperature will easily lead to the dispersion and passivation of clay in the drilling fluid and the failure of the drilling fluid treatment agent, which will deteriorate the performance of the drilling fluid. Deep wells often drill through strata such as mud shale and coal rock. In addition, the open hole section is long, and it is easy to cause well collapse and pipe sticking problems under the immersion of drilling fluid. The drilling time of the production layer is long and the amount of drilling fluid invaded into the oil and gas layer is large, which is not conducive to the protection of the oil and gas layer. In deep well drilling, sal...

AI Technical Summary

Problems solved by technology

Ordinary drilling fluids can no longer meet the requirements of drilling fluid density, temperature, rheology, lubricity, inhibition, water loss and wall-building properties during drilling operations in deep oil and gas exploration and development.

Wellbore instability, drill sticking and breakage, drilling fluid leakage, reservoir creep and other situations are also common, which have a great impact on drilling work, reducing efficiency and increasing costs

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